WO2016186021A1

WO2016186021A1 - Terminal and terminal-equipped electric wire

Info

Publication number: WO2016186021A1
Application number: PCT/JP2016/064254
Authority: WO
Inventors: 高信嶋田; 拓次大塚; 佳久横山; 隆彦濱口; 丈博中田; 悟史森川; 浩史浜田
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2015-05-15
Filing date: 2016-05-13
Publication date: 2016-11-24

Abstract

This terminal-equipped electric wire 50 provided with an electric wire 40 obtained by covering a core wire 42 with an insulation coating 43, and a terminal 10 connected to the electric wire 40, comprises: a bottom wall 34 on which the electric wire 40 is placed; an insulation barrel 32 which projects from the bottom wall 34 and which is press-fit to the outer periphery of the insulation coating 43; and a connection part 33 which projects from a position, in the bottom wall 34, that is closer to the core wire 42, exposed from the insulation coating 43, than the insulation barrel 32. In a state where the insulation barrel 32 is press-fit to the insulation coating 43, the connection part 33 covers the insulation coating 43 of the electric wire 40 excluding a portion, of the electric wire 40, on a side opposite to the bottom wall 34.

Description

Terminal and electric wire with terminal

The present invention relates to a terminal connected to an electric wire and an electric wire with a terminal.

Conventionally, the terminal described in Patent Document 1 is known as a terminal connected to an electric wire in which the outer periphery of a core wire is covered with an insulating coating. This terminal has an insulation barrel that is crimped from the outside of the insulating coating, and a wire barrel that is crimped from the outside of the core wire exposed from the insulating coating.

JP 2009-193891 A

In a wire with a terminal in which a terminal is connected to one end of the wire, a relatively heavy device may be connected to the other end of the wire. In such an electric wire with a terminal, it is required that the connection between the electric wire and the terminal is maintained even when the device is dropped.

In the prior art, in order to firmly connect the wire barrel and the core wire, a configuration in which a recess is formed on the surface of the wire barrel that contacts the core wire is described. However, recently, the demand for electric wires with terminals has become strict, and there is a concern that the connection structure between the wire barrel and the core wire alone will not be sufficient.

The technology disclosed in the present specification has been conceived in view of the above-described problems, and an object thereof is to provide a terminal with improved holding power for an electric wire and an electric wire with a terminal.

The present invention is a terminal connected to an electric wire whose core wire is covered with an insulating coating, and a bottom wall on which the electric wire is placed, and a crimping portion that protrudes from the bottom wall and is crimped to the outer periphery of the insulating coating. A connecting portion that protrudes from the core wire side exposed from the insulating coating with respect to the crimping portion of the bottom wall, and the crimping portion is crimped to the insulating coating, The insulating coating of the electric wire is covered except for a portion of the electric wire that is located on the side opposite to the bottom wall.

Further, the present invention is a terminal-attached electric wire comprising: an electric wire having a core wire covered with an insulating coating; and a terminal connected to the electric wire, the bottom wall on which the electric wire is placed, and the bottom wall A pressure-bonding portion that protrudes and is crimped to the outer periphery of the insulating coating; and a connecting portion that protrudes from a position on the core wire side exposed from the insulating coating with respect to the pressure-bonding portion of the bottom wall. In a state where is crimped to the insulating coating, the connecting portion covers the insulating coating of the electric wire except for a portion of the electric wire located on the side opposite to the bottom wall.

According to the present invention, it is possible to improve the holding force between the terminal and the electric wire by covering the insulating coating except the portion where the connecting portion is located on the side opposite to the bottom wall.

On the other hand, by adopting a configuration in which the connecting portion does not cover the portion located on the opposite side to the bottom wall, the connecting portion and the crimping portion are configured to be mechanically divided in the region opposite to the bottom wall. ing. Thereby, even when a connection part covers insulation coating, a connection part does not exert a dynamic influence on a crimping | compression-bonding part. As a result, since the insulating coating can be held in an appropriate form by the crimping portion, the holding force between the terminal and the electric wire can be improved.

The following embodiments are preferred as embodiments of the present invention.

It is preferable that the pressure-bonding portion has a pair of pressure-bonding pieces, and the pair of pressure-bonding pieces are pressed against each other with their tip portions facing each other in a state of being pressure-bonded to the insulating coating.

According to the above aspect, the tip surfaces of the pair of crimping pieces are brought into contact with each other, so that the tip portions are brought into contact with each other, and the inner peripheral surface on the insulating coating side of the crimping pieces is substantially continuous. Therefore, it is difficult for the edge of the tip portion to bite into the insulation coating, and even when the crimping piece is crimped to the insulation coating with high compression, it is avoided that the insulation coating is damaged.

It is preferable that an inclined portion that is inclined in a tapered shape toward the tip portion of the crimping piece is formed at an edge portion on the insulating coating side of the tip portion of the crimping piece.

According to the above aspect, when the crimping piece is crimped with a strong force against the insulation coating, the insulation coating is pressed by the crimping piece in the process of crimping, and the insulation coating is pushed between the tip portions of the pair of crimping pieces. There is concern over biting. By providing such an inclined portion, a portion of the insulating coating that is likely to be bitten is easily released into a mountain-shaped region surrounded by the pair of inclined portions, and biting can be avoided.

Moreover, the technique described in this specification can be suitably used when the core wire is made of aluminum or an aluminum alloy.

Recently, in order to reduce the weight of the electric wire, the core wire may be made of aluminum or an aluminum alloy. Furthermore, there is an increasing need for an electric wire having a smaller core diameter than before. In the case of such an electric wire, since the strength is lower than that of a conventional electric wire, when a large force is applied to the electric wire in a state where it is connected to the terminal, there is a concern that the portion crimped to the crimping portion may be disconnected. . According to this aspect, since the insulating coating can be held also by the connecting portion, the holding force between the electric wire and the terminal can be improved.

According to the present invention, the holding force between the terminal and the electric wire can be improved.

The side view which shows the electric wire with a terminal concerning Embodiment 1 Side view showing terminals Partially enlarged perspective view showing the wire connection part Partially enlarged plan view showing opening Sectional drawing which shows the state before an insulation barrel is crimped | bonded to insulation coating Sectional drawing which shows the state after an insulation barrel is crimped | bonded to insulation coating The side view which shows the electric wire with a terminal concerning Embodiment 2 Side view showing terminals Partially enlarged plan view showing opening

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6. The terminal 10 in this embodiment is made of copper or a copper alloy. The terminal 10 includes a connecting portion 20 that has a rectangular tube shape and is connected to a mating terminal (not shown), and a wire connecting portion 30 that is formed behind the connecting portion 20 and connected to the electric wire 40. When the terminal of the electric wire 40 is connected to the electric wire connection part 30, the electric wire 50 with a terminal is comprised. In the following description, the upper side in FIG. 1 is the upper side, and the lower side is the lower side. Further, the left side in FIG. 1 is the front and the right side is the rear.

(Wire 40)
As shown in FIG. 4, the electric wire 40 has a configuration in which a core wire 42 formed by twisting a plurality of metal strands 41 is covered with an insulating coating 43 made of an insulating synthetic resin. The metal element wire 41 can use any metal such as copper, copper alloy, aluminum, or aluminum alloy. In addition, the metal strand 41 of this embodiment is comprised with the aluminum alloy.

(Terminal 10)
As shown in FIG. 1, the connection part 20 has comprised the substantially rectangular tube shape. An elastic contact piece (not shown) is provided inside the connection portion 20. By inserting a tab-like mating terminal inside the connecting portion 20, the mating terminal and the elastic contact piece are elastically connected. Thereby, the other party terminal and the terminal 10 are electrically connected.

As shown in FIG. 2, the wire connection portion 30 includes a wire barrel 31 to which the end of the core wire 42 of the wire 40 is crimped, and an insulation barrel disposed behind the wire barrel 31 and to which the insulating coating 43 of the wire 40 is fixed. 32 (an example of a crimping portion) and a connecting portion 33 that connects the wire barrel 31 and the insulation barrel 32. The wire barrel 31, the connecting portion 33, and the insulation barrel 32 have a bottom wall 34 that extends in the front-rear direction (the axial direction of the electric wire 40), and core wire crimping pieces 31 A and side walls that protrude from both side edges of each bottom wall 34. 33A and the insulation coating crimping piece 32A (an example of a crimping piece).

(Wire barrel 31)
As shown in FIG. 3, the wire barrel 31 is an open barrel type, in which the ends of the core wire 42 are arranged along the front-rear direction of the bottom wall 34, and the ends of the core wire 42 are crimped by a pair of core wire crimping pieces 31A. Thus, the core wire 42 can be crimped. The core wire 42 and the wire barrel 31 are electrically connected when the core wire 42 contacts the inner surfaces of both the core wire crimping pieces 31 A and the bottom wall 34 so as to be conductive. In addition, the wire barrel 31 has a rectangular shape that is long in the up-down direction (direction orthogonal to the front-rear direction) in the unfolded state before the electric wire 40 is crimped.

A plurality of recesses 38 are formed on the surface of the wire barrel 31 that contacts the core wire 42. By crimping the wire barrel 31 so as to wrap around the outside of the core wire 42, the hole edge portion of the recess 38 bites into the surface of the core wire 42. As a result, good conduction between the core wire 42 and the wire barrel 31 can be achieved, and the holding force of the core wire 42 can be increased.

(Insulation barrel 32)
The insulation barrel 32 is an open barrel type, in which the insulation coating 43 of the electric wire 40 is disposed along the front-rear direction of the bottom wall 34, and the insulation coating 43 is crimped by both insulation coating crimping pieces 32A to insulate the electric wire 40. It can be fixed to the barrel 32. The insulation barrel 32 has a rectangular shape extending in the vertical direction (a direction orthogonal to the front-rear direction) in a developed state before the electric wire 40 is crimped.

The pair of insulation coating crimping pieces 32 A are wound around the outer periphery of the insulating coating 43 of the electric wire 40 placed on the bottom wall 34, and are crimped in the radial direction against the outer peripheral surface of the insulating coating 43. . When the pair of insulation coating crimping pieces 32A are crimped to the insulation coating 43, the tip portions 35 of each other face each other and are abutted against each other.

Furthermore, as shown in FIG. 5, the corner | angular part of the inner edge distribute | arranged to the insulation coating 43 side among the front-end | tip parts 35 of the insulation coating crimping piece 32A is along the axial direction (front-back direction) of the electric wire 40. The cutout portion is obliquely cut so as to extend, and the cutout portion is an inclined portion 36. In other words, the edge on the insulating coating 43 side of the tip portion 35 of the insulating coating crimping piece 32 A is formed to be inclined in a tapered shape toward the tip portion 35.

FIG. 6 is a diagram showing a cross-sectional configuration of the insulation barrel 32 in a crimped state. As shown in FIG. 6, the pair of insulation coating crimping pieces 32 A are crimped while being wound around the outer periphery of the insulation coating 43 so that the front end portions 35 thereof face each other and are closely overlapped with each other. . Thus, in a state where the pair of insulation coating crimping pieces 32A is crimped to the insulation coating 43, the pair of inclined portions 36 are provided on the inner peripheral surface side of these abutting portions toward the outside in the radial direction of the electric wire 40. A relief space 37 having a gentle mountain-like cross section is formed.

In such a crimped state, the inner peripheral surface (the surface on the insulating coating 43 side) of the insulation barrel 32 is in a substantially continuous state. Specifically, although the above-described escape space 37 is formed, the escape space 37 is different from a right-angled step or an acute edge, and the inner periphery excluding the inclined portion 36 of the insulation coating crimping piece 32A in a gentle state. It is continuous with the surface.

(Connecting part 33)
The wire barrel 31 and the insulation barrel 32 described above are connected by a connecting portion 33. The connecting portion 33 has a pair of side walls 33A that rise from both side edges of the bottom wall 34 and sandwich the outer peripheral portion of the insulating coating 43 from the left and right sides.

As shown in FIG. 2, in the present embodiment, the protruding height dimension of the core wire crimping piece 31 A from the bottom wall 34 is set to be larger than the projecting height dimension of the insulating coating crimping piece 32 A from the bottom wall 34. Yes. Further, the protruding height dimension of the side wall 33A from the bottom wall 34 is set to be smaller than the protruding height dimension of the insulating coating crimping piece 32A from the bottom wall 34. The shape of the upper end edge of the core wire crimping piece 31A, the upper end edge of the side wall 33A, and the upper end edge of the insulating coating crimping piece 32A is substantially U-shaped when viewed from the side.

As shown in FIG. 1, in a state where the wire barrel 31 and the insulation barrel 32 are crimped to the electric wire 40, the side wall 33A covers the insulating coating 43 of the electric wire 40 from the side as viewed from the side. . In other words, when viewed from the side, the insulation coating of the electric wire 40 is blocked by the side wall 33A so that it cannot be seen.

Thus, the protruding height dimension of the side wall 33A from the bottom wall 34 is the height dimension of the insulating coating 43 upward from the bottom wall 34 in a state where the insulation barrel 32 is crimped to the insulating coating 43 of the electric wire 40. Is set larger than.

On the other hand, as shown in FIG. 4, the region surrounded by the wire barrel 31, the side wall 33 A, and the insulation barrel 32 when viewed from above in the state where the wire barrel 31 and the insulation barrel 32 are crimped to the electric wire 40. Is an opening 45 that opens upward. The insulating coating 43 and the core wire 42 of the electric wire 40 are exposed from the opening 45. That is, the insulation coating 43 and the core wire 42 of the electric wire 40 are exposed from the opening 45 at a portion located on the side opposite to the bottom wall 34 and are not covered with the side wall 33A.

(Operation and effect of the embodiment)
Then, the effect | action and effect of this embodiment are demonstrated. According to this embodiment, the terminal 10 of the electric wire 50 with a terminal includes a bottom wall 34 on which the electric wire 40 is placed, an insulation barrel 32 that protrudes from the bottom wall 34 and is crimped to the outer periphery of the insulating coating 43, and a bottom A connecting portion 33 projecting from the side of the core wire 42 exposed from the insulating coating 43 than the insulation barrel 32 of the wall 34, and in a state where the wire barrel 31 is crimped to the insulating coating 43, The insulating coating 43 of the electric wire 40 is covered except for a portion of the electric wire 40 located on the side opposite to the bottom wall 34.

According to the above configuration, the holding force between the terminal 10 and the electric wire 40 can be improved by covering the insulating coating 43 except the portion where the connecting portion 33 is located on the side opposite to the bottom wall 34.

On the other hand, by adopting a configuration in which the connecting portion 33 does not cover the portion located on the opposite side of the bottom wall 34, the connecting portion 33 and the insulation barrel 32 are mechanically moved in the region opposite to the bottom wall 34. It has a divided structure. Thereby, even when the connecting portion 33 covers the insulating coating 43, the connecting portion 33 does not exert a mechanical influence on the tip portion 35 of the insulation barrel 32. As a result, since the insulation coating 43 can be held in an appropriate form by the insulation barrel 32, the holding force between the terminal 10 and the electric wire 40 can be improved.

Further, the connection portion 33 is configured not to cover the portion located on the opposite side of the bottom wall 34, so that the wire barrel 31 and the insulation barrel 32 are also mechanically divided. . Accordingly, when the wire barrel 31 is crimped to the core wire 42 and the insulation barrel 32 is crimped to the insulating coating 43, the deformed state of the wire barrel 31 and the deformed state of the insulation barrel 32 influence each other. Is suppressed. As a result, the wire barrel 31 can have an optimum shape for crimping to the core wire 42, and further, an optimum crimping condition for crimping to the core wire 42 can be set. In addition, it is possible to set an optimum shape for crimping to the insulating coating 43 and to set optimum crimping conditions for crimping to the insulating coating 43. Thereby, the retention strength between the electric wire 40 and the terminal 10 can be further improved. In the present embodiment, for example, the protruding height dimension of the core wire crimping piece 31A from the bottom wall 34 is set to be larger than the projecting height dimension of the insulating coating crimping piece 32A from the bottom wall 34.

In addition, according to the present embodiment, the insulation barrel 32 has a pair of insulating coating crimping pieces 32 A, and the pair of insulating coating crimping pieces 32 A face each other with their distal end portions 35 facing each other. It comes to be faced with. Thereby, there is no portion which is strongly pressed locally against the insulating coating 43 on the inner peripheral surface side in contact with the insulating coating 43 in the insulating coating pressure-bonding piece 32A, and an edge or the like is formed on the insulating coating 43 even in a highly compressed state. Biting in is suppressed from scratching.

Further, according to the present embodiment, the edge portion on the insulating coating 43 side of the distal end portion 35 of the insulating coating crimping piece 32A has an inclined portion 36 that inclines in a tapered shape toward the distal end portion 35 of the insulating coating crimping piece 32A. Is formed.

When the insulation barrel 32 is crimped with a strong force, a part of the insulating coating 43 is pressed upward from below in the process of crimping the pair of insulating coating crimping pieces 32A. Then, there is a concern that the insulating coating 43 pushed up by the insulating coating crimping piece 32 A is bitten between the pair of tip portions 35. Even in such a case, since the insulation coating 43 that is about to be bitten is released into the escape space 37, biting can be avoided. Thereby, since it is suppressed that the insulation coating 43 is damaged, the insulation coating 43 can be hold | maintained in a highly compressed state by the insulation coating crimping piece 32A. As a result, the holding force between the terminal 10 and the electric wire 40 can be improved.

Further, according to the present embodiment, the core wire 42 is made of aluminum or an aluminum alloy. Recently, in order to reduce the weight of the electric wire 40, the core wire 42 may be made of aluminum or an aluminum alloy. Furthermore, there is an increasing need for the electric wire 40 having a smaller core wire diameter than before. In the case of such an electric wire 40, since the strength is lower than that of a conventional electric wire, when a large force is applied to the electric wire 40 in a state where it is connected to the terminal 10, the portion crimped to the wire barrel 31 is disconnected. Is concerned. According to this embodiment, since the insulation coating 43 can be held also by the connecting portion 33, the holding force between the electric wire 40 and the terminal 10 can be improved. As described above, the technique described in this specification can be suitably used for the electric wire 40 in which the core wire 42 is made of aluminum or an aluminum alloy and the core wire 42 has a relatively small diameter.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIGS. As shown in FIG. 8, in the present embodiment, the protruding height dimension of the core wire crimping piece 31A from the bottom wall 34 is set to be larger than the projecting height dimension of the insulating coating crimping piece 32A from the bottom wall 34. Yes. Further, the protruding height dimension of the side wall 33A from the bottom wall 34 is set to be smaller than the protruding height dimension of the insulating coating crimping piece 32A from the bottom wall 34.

The upper end edge of the side wall 33A and the upper end edge of the insulating coating pressure-bonding piece 32A are connected by an inclined edge portion 60 whose side wall 33A side is linearly lowered. In the present embodiment, the inclined edge portion 60 is formed in a straight line shape when viewed from the side, but is not limited thereto, and the inclined edge portion 60 may be formed in a curved shape when viewed from the side surface.

As shown in FIG. 7, in a state where the wire barrel 31 and the insulation barrel 32 are crimped to the electric wire 40, the side wall 33 A covers the insulating coating 43 of the electric wire 40 from the side as viewed from the side. . In other words, when viewed from the side, the insulation coating of the electric wire 40 is blocked by the side wall 33A so that it cannot be seen.

In the state of being crimped to the electric wire 40, the upper end edge of the insulation barrel 32 and the upper end edge of the connecting portion 33 are connected by a curve that gently descends in a curved line toward the front.

As shown in FIG. 9, the region surrounded by the wire barrel 31, the side wall 33 A, and the insulation barrel 32 when viewed from above in the state where the wire barrel 31 and the insulation barrel 32 are crimped to the electric wire 40. Is an opening 61 that opens upward. The insulating coating 43 and the core wire 42 of the electric wire 40 are exposed from the opening 61. That is, the insulating coating 43 and the core wire 42 of the electric wire 40 are exposed from the opening 61 at a portion located on the side opposite to the bottom wall 34. Specifically, the insulating coating 43 and the core wire 42 of the electric wire 40 are exposed from the opening 61 while the insulating coating is covered by the portion of the connecting portion 33 where the inclined edge portion 60 is formed.

In the present embodiment, the opening 61 has a substantially droplet shape in which the core wire 42 side is curved and the insulation barrel 32 side is tapered.

Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

The upper end edge of the side wall 33A and the upper end edge of the insulating coating pressure-bonding piece 32A are connected by an inclined edge portion 60 whose side wall 33A side is linearly lowered. By covering the insulating coating 43 with the portion where the inclined edge portion 60 is formed, the holding force between the electric wire 40 and the terminal 10 can be further improved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In the present embodiment, the terminal 10 is a female terminal, but is not limited thereto, and may be a male terminal. Further, a so-called LA terminal in which a through hole into which a bolt is inserted is formed in a plate-like connection portion may be used. Moreover, what is called a splice terminal which has a wire barrel, a connection part, and an insulation barrel, and a some electric wire is connected, without providing a connection part may be sufficient.

(2) In the present embodiment, the wire barrel 31 and the insulation barrel 32 have an open barrel structure, but are not limited thereto, and may have a closed barrel structure.

(3) In this embodiment, the protruding height dimension of the core wire crimping piece 31A from the bottom wall 34 is set to be larger than the projecting height dimension of the insulation coating crimping piece 32A from the bottom wall 34. However, the protruding height dimension of the core wire crimping piece 31A from the bottom wall 34 may be set smaller than the projecting height dimension of the insulating coating crimping piece 32A from the bottom wall 34, and , May be set to the same value.

(4) In the first embodiment, the shape of the upper end portion of the connecting portion 33 (side wall 33A) is substantially U-shaped when viewed from the side, but is not limited thereto, and is substantially C when viewed from the side. The shape can be any shape such as a letter shape or a substantially V shape.

10: Terminal 32: Insulation barrel (an example of a crimping part)
32A: Insulation-coated crimping piece (an example of a crimping piece)
33: Connecting portion 34: Bottom wall 35: Tip portion 36: Inclined portion 40: Electric wire 42: Core wire 43: Insulation coating 50: Electric wire with terminal

Claims

A terminal connected to an electric wire whose core wire is covered with an insulation coating,
A bottom wall on which the electric wire is placed;
A crimping part protruding from the bottom wall and crimped to the outer periphery of the insulating coating;
Of the bottom wall, comprising a connecting portion protruding from the core wire side exposed from the insulation coating than the crimping portion,
In a state where the crimping part is crimped to the insulating coating, the connecting part covers the insulating coating of the electric wire except for a portion of the electric wire that is located on the side opposite to the bottom wall.
2. The terminal according to claim 1, wherein the crimping portion has a pair of crimping pieces, and the pair of crimping pieces are abutted with each other with their tip portions facing each other in a state of being crimped to the insulating coating.
The terminal according to claim 2, wherein an inclined portion that is inclined in a tapered shape toward the tip portion of the crimping piece is formed at an edge portion on the insulating coating side of the tip portion of the crimping piece.
An electric wire with a terminal comprising: an electric wire having a core wire covered with an insulation coating; and a terminal connected to the electric wire,
A bottom wall on which the electric wire is placed;
A crimping part protruding from the bottom wall and crimped to the outer periphery of the insulating coating;
Of the bottom wall, provided with a connecting portion that protrudes from the position on the core wire side exposed from the insulating coating than the crimping portion,
The terminal-attached electric wire that covers the insulating coating of the electric wire except for a portion of the electric wire located on the side opposite to the bottom wall in the state where the crimping portion is crimped to the insulating coating.
The electric wire with a terminal according to claim 4, wherein the crimping portion has a pair of crimping pieces, and the pair of crimping pieces are pressed against the insulating coating and faced with each other while facing each other.
The electric wire with a terminal according to claim 5, wherein an inclined portion that inclines in a tapered shape toward the tip portion of the crimping piece is formed at an edge on the insulating coating side of the tip portion of the crimping piece. .
The terminal-attached electric wire according to any one of claims 4 to 6, wherein the core wire is made of aluminum or an aluminum alloy.